"..both calorie restriction and intermittent fasting along with vitamin and mineral intake, increase resistance to disease, extend lifespan, and stimulate production of neurons from stem cells.

In addition, fasting has been shown to enhance synaptic elasticity, possibly increasing the ability for successful re-wiring following brain injury. These benefits appear to result from a cellular stress response, similar in concept to the greater muscular regeneration that results from the stress of regular exercise.

Additional research suggests that increasing time intervals between meals might be a better choice than chronic calorie restriction, because the resultant decline in sex hormones may adversely affect both sexual and brain performance"

And then she made the following, false, statement

"It should go without saying that short-term cognitive and physical performance is not boosted by fasting, due to metabolic changes including decrease in body temperature, decreased heart rate and blood pressure and decreased glucose and insulin levels, so you’re better off not planning a marathon or a demanding work session during a fasting period"

"A high meal frequency does not boost your metabolism, nor does fasting or a low frequency slow it down either. The latter has been shown quite clearly when researchers made people fast for 72 hours and found no difference in metabolic rate at the 12 hour mark, compared to the 72 hour mark. That’s three days without food, yet all subjects retained a fully intact metabolic rate. There are other studies looking at one meal a day and alternate day fasting that does not find an impact on metabolism either.

Some studies have actually found that fasting boosts metabolic rate slightly during the initial 36 hours - this is supposedly an evolutionary response, mediated by norepinephrine, as the body mobilizes extra energy when food is scarce. You can imagine it would be highly counterproductive to mister caveman if he found himself slow and lethargic when he needed to find food in order to not starve to death."

I've always found I become increasingly alert after going without food for some time. Normally accidentally I'll miss a meal or two and I feel like I'm on something. Very hyper, energetic and clear headed.

Then I eat and bleh - slow down. Can reduce the slow down by only eating fruit I've found.